Repair And Troubleshooting - Bosch Rexroth VT-VSPD Series Installation And Operation Manual

10/48 Bosch Rexroth AG | Hydraulics
2 Installing the VSPD
2.2

Repair and Troubleshooting

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When using differential inputs switch both inputs on and off at the same time.
When switching signal inputs, use dry circuit rated relays with gold-plated con-
tacts (low voltages, low currents)
Always shield all analog signal lines. Connect shields at the card end only, con-
necting to the "Shield" terminal, and leave the other end open to prevent ground
loops.
Connect to an appropriate system ground using stranded copper wire (min
2.5mm2 / 12 AWG)
The system ground is an essential component of the EMC protection for the con-
troller card. The ground provides a path for noise that could otherwise enter the
controller card through the signal and power supply lines. Noise is bypassed only
if the system ground does not couple noise into the controller card.
Rexroth also recommends shielding solenoid wiring.
Do not use logical signals from the controller card (IE: "OK" signal) for switching
machine safety circuits
(see European Norm "Safety Requirements for Fluid Power Systems and Com-
ponents" EN982:1996).
If the control cabinet contains additional electrical components utilizing high voltage,
always observe safety standards to prevent accidents! Use appropriate protective
gear, such as safety shoes and safety gloves, when prudent!
Use appropriate tools (IE: insulated tools)
Before opening control cabinet doors, open the main disconnect.
To ensure safe working conditions, observe the following safety rules:
Remove all power
Ensure against unintended energization: lockout devices when possible, and use
lockout warning tags
Verify that voltage is not present
Cover or close off adjacent areas that are still energized.
If work on energized components is necessary, have a second person present as a
safety backup to actuate an E-STOP switch or open the main disconnect, if neces-
sary. Use insulated tools only
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Installation and operation | RE 30523-B/09.13